Weather Topic: What are Altostratus Clouds?

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.

Weather Topic: What are Cumulonimbus Clouds?

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an
altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal
the approach of stormy weather, such as thunderstorms or blizzards.